Where to add Weighted Vest Walks?

At 64 I do the following program based on Wendler 531 2x2x2. Mobility is everyday. I workout in the morning and recently my wife has been walking with me after each session to get some exercise. We are now thinking of doing weighted vest walking twice a week building uo to 20 lbs. My question is what whould be the best days to do them. After the Lifting Sessions or the Airdyne sessions. Thanks.

Monday
Squat – 3 sets of 5 Pros / 2 sets of 5-8 FSL
Close-grip Bench – 3 sets of 5 Pros / 2 sets of 5-8 FSL
Circuit of 3-5 sets of 10:
•Pulldowns
•DB RDLs
•DB Push-Press
Superset 3 sets of 10-15:
•Triceps Rope Pushdown/Ab Wheel
2.5-mile walk

Tuesday
Air dyne 20 min HIIT
2.5-mile walk

Wednesday
Active Rest

Thursday
Trap-bar Deadlift – 3 sets of 5 Pros / 2 sets of 5-8 SLDL
Press – 3 sets of 5 Pros / 2 sets of 5-8 FSL
Circuit of 3-5 sets of 10
•Inverted Rows
•Goblet Squat
•Push Up
Superset 3 sets of 10-15:
•DB Curl/BB Calf Raise
2.5-mile walk

Friday
Air dyne 20 min HIIT
2.5-mile walk

Saturday
Kettlebell Swings/Farmer Walks –5 sets
2.5-mile walk

Sunday
Active Rest

Just wear it when you hop on the airdyne

I would do it the same day as the AirDyne if it was me. I typically save my weighted walks for days I don’t lift but that’s just me personally.

You can do it to warm up or for post workout cooldown.

Like, if you have depleted your stamina in a workout but still feel like burning out calories. Or if you want to condition yourself or your training then you can do it before.

Honestly it won't matter which day. There won't be any benefit to a specific day other than your energy levels and time you have available and even weather dependent. As long as you can get them in that will be what matters most. Could even do it on the days you plan to eat a more calories (family dinners, birthdays).